Played with a d600 totay. Amazing quality video but a huge flaw. You can not change aperture once you start filming. You have to quit recording, turn off live view then change it. Then you have to start live view, then start recording again. HUGE flaw. This is not the case with the d800. Hoping I am missing something but pretty sure this is true.Anyone know a work around?

Imagine if you are shooting a live event or actually following somebody who is moving in and out of different light.You don't always need it but it's a huge flaw if you do.It's about 8-10 secs to change even a third of a stop.

The other problem with changing aperture while shooting is that you're touching the camera and introducing shake.

Cine lenses, such as this, are the way to go if changing aperture while recording is something you want to do on a regular basis. Get a rig with both a follow focus and an aperture wheel. Or just use your fingers on the geared aperture ring. Likely far less shake introduced than using buttons on the camera and much faster to boot.